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Using the anti-flooding feature of sh404SEF you can limit the rate at which requests from a given IP address are accepted by your web site:

sh404SEF anti-flooding configuration

By default, sh404SEF will allow at most 10 requests in a 10 seconds period of time coming from the same IP address. Any additional request will be denied with a 403 Forbidden HTTP status code response.

Access will be granted again as soon as the request rate goes below 10 requests in 10 seconds.